/* The student24 palette, hand-written. No build step and no framework: this site is three people
   wide and will never justify an npm install in the deploy pipeline. */
:root {
    --ink: #0f172a;
    --ink-soft: #334155;
    --muted: #64748b;
    --line: #e2e8f0;
    --paper: #f6f7fa;
    --card: #fff;
    --wash: #eff6ff;
    --accent: #2563eb;
    --accent-deep: #1d4ed8;
    --good: #059669;
    --good-wash: #ecfdf5;
    --danger: #dc2626;
    --danger-wash: #fef2f2;
    --warn: #b45309;
    --warn-wash: #fffbeb;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font: 15px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body.bare { display: grid; place-items: center; min-height: 100vh; }

a { color: var(--accent-deep); }

/* ---- chrome ------------------------------------------------------------------------------- */
.top {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 0 24px;
    height: 56px;
    background: var(--card);
    border-bottom: 1px solid var(--line);
}

.mark { font-weight: 800; text-decoration: none; color: var(--ink); letter-spacing: -0.02em; }
.mark span { color: var(--accent); }
.mark em { font-style: normal; font-weight: 600; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.14em; margin-left: 6px; }

.top nav { display: flex; gap: 4px; margin-right: auto; }
.top nav a {
    padding: 7px 12px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--ink-soft);
    font-size: 14px;
}
.top nav a:hover { background: var(--paper); }
.top nav a.active { background: var(--wash); color: var(--accent-deep); font-weight: 600; }

.out { display: flex; align-items: center; gap: 12px; }
.who { font-size: 13px; color: var(--muted); }

main { padding: 28px 24px 64px; max-width: 1180px; margin: 0 auto; }

h1 { font-size: 24px; letter-spacing: -0.02em; margin: 0 0 4px; }
h2 { font-size: 15px; margin: 0 0 12px; }
.lede { color: var(--muted); margin: 0 0 24px; }

/* ---- cards and figures --------------------------------------------------------------------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 28px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.card .n { font-size: 32px; font-weight: 800; letter-spacing: -0.03em; line-height: 1.1; }
.card .k { font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 8px; }
.card .sub { font-size: 13px; color: var(--muted); margin-top: 4px; }
.card.accent .n { color: var(--accent); }
.card.quiet { background: var(--paper); }

.panel { background: var(--card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; margin-bottom: 24px; }
.panel > header { padding: 16px 18px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 12px; }
.panel > header h2 { margin: 0; }
.panel .body { padding: 18px; }

/* ---- tables -------------------------------------------------------------------------------- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); padding: 10px 18px; border-bottom: 1px solid var(--line); font-weight: 600; }
td { padding: 11px 18px; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--paper); }
td.mono, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; color: var(--ink-soft); }

.pill { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11px; font-weight: 600; }
.pill.ok { background: var(--good-wash); color: var(--good); }
.pill.warn { background: var(--warn-wash); color: var(--warn); }
.pill.bad { background: var(--danger-wash); color: var(--danger); }
.pill.quiet { background: var(--paper); color: var(--muted); }

.empty { padding: 32px 18px; text-align: center; color: var(--muted); }

/* ---- forms --------------------------------------------------------------------------------- */
form.stack { display: grid; gap: 14px; }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; }
input[type=text], input[type=email], input[type=password], input[type=search], select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 10px;
    font: inherit;
    background: var(--paper);
    color: var(--ink);
}
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgb(37 99 235 / 0.16); }

button, .btn {
    font: inherit;
    font-weight: 600;
    font-size: 14px;
    padding: 9px 15px;
    border-radius: 10px;
    border: 1px solid transparent;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
button:hover, .btn:hover { background: var(--accent-deep); }
button.ghost, .btn.ghost { background: var(--card); color: var(--ink-soft); border-color: var(--line); }
button.ghost:hover, .btn.ghost:hover { background: var(--paper); }
button.danger, .btn.danger { background: var(--danger); }
button.danger:hover { background: #b91c1c; }

.alert { padding: 11px 14px; border-radius: 10px; font-size: 14px; margin-bottom: 4px; }
.alert.bad { background: var(--danger-wash); color: var(--danger); }
.alert.ok { background: var(--good-wash); color: var(--good); }

/* ---- sign in ------------------------------------------------------------------------------- */
.signin { width: min(380px, 92vw); background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 32px; }
.signin .mark { display: block; margin-bottom: 6px; font-size: 20px; }
.signin p.lede { font-size: 14px; margin-bottom: 22px; }

.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 18px; }
.toolbar input[type=search] { max-width: 320px; }
.toolbar label.inline { display: flex; align-items: center; gap: 6px; font-weight: 500; color: var(--muted); margin: 0; font-size: 13px; }